diff --git a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/IErpProjectContractsService.java b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/IErpProjectContractsService.java
index 0e9ce200..9f67e216 100644
--- a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/IErpProjectContractsService.java
+++ b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/IErpProjectContractsService.java
@@ -66,4 +66,9 @@ public interface IErpProjectContractsService {
      * @return 是否删除成功
      */
     Boolean deleteWithValidByIds(Collection<Long> ids, Boolean isValid);
+
+    /**
+     * 按项目关联合同总价回写项目主表 amount
+     */
+    void syncProjectAmountByLinkedContracts(Long projectId);
 }
diff --git a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpContractOrderServiceImpl.java b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpContractOrderServiceImpl.java
index ff7e6df5..2bf3542a 100644
--- a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpContractOrderServiceImpl.java
+++ b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpContractOrderServiceImpl.java
@@ -33,6 +33,7 @@ import org.dromara.oa.crm.domain.vo.CrmCustomerInfoVo;
 import org.dromara.oa.crm.service.ICrmCustomerInfoService;
 import org.dromara.oa.erp.service.IErpContractChangeService;
 import org.dromara.oa.erp.service.IErpContractOrderService;
+import org.dromara.oa.erp.service.IErpProjectContractsService;
 import org.dromara.oa.erp.service.IErpProjectInfoService;
 import org.dromara.oa.erp.service.IErpProjectTypeService;
 import org.dromara.oa.erp.domain.vo.ErpProjectTypeVo;
@@ -78,6 +79,7 @@ public class ErpContractOrderServiceImpl implements IErpContractOrderService {
     private final ErpContractInfoMapper contractInfoMapper;
     private final ErpContractMaterialMapper contractMaterialMapper;
     private final ErpProjectContractsMapper projectContractsMapper;
+    private final IErpProjectContractsService projectContractsService;
 
     private final IErpContractChangeService erpContractChangeService;
     private final IErpProjectInfoService projectInfoService;
@@ -424,6 +426,10 @@ public class ErpContractOrderServiceImpl implements IErpContractOrderService {
                 } else {
                     projectContractsMapper.insertOrUpdate(projectContracts);
                 }
+                if ("0".equals(projectContractsBo.getProjectSource())) {
+                    // 选择已有项目：关联当前合同后，项目金额更新为项目关联合同总价之和
+                    projectContractsService.syncProjectAmountByLinkedContracts(projectContractsBo.getProjectId());
+                }
             }
 
             // 删除在旧列表中但不在新列表中的关联
diff --git a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpProjectContractsServiceImpl.java b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpProjectContractsServiceImpl.java
index 9eea9bd0..d276a8d0 100644
--- a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpProjectContractsServiceImpl.java
+++ b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpProjectContractsServiceImpl.java
@@ -13,11 +13,19 @@ import org.springframework.stereotype.Service;
 import org.dromara.oa.erp.domain.bo.ErpProjectContractsBo;
 import org.dromara.oa.erp.domain.vo.ErpProjectContractsVo;
 import org.dromara.oa.erp.domain.ErpProjectContracts;
+import org.dromara.oa.erp.domain.ErpProjectInfo;
 import org.dromara.oa.erp.mapper.ErpProjectContractsMapper;
+import org.dromara.oa.erp.mapper.ErpProjectInfoMapper;
 import org.dromara.oa.erp.service.IErpProjectContractsService;
 
+import cn.hutool.core.collection.CollUtil;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Collection;
 
 /**
@@ -31,6 +39,7 @@ import java.util.Collection;
 public class ErpProjectContractsServiceImpl implements IErpProjectContractsService {
 
     private final ErpProjectContractsMapper baseMapper;
+    private final ErpProjectInfoMapper projectInfoMapper;
 
     /**
      * 查询项目关联合同
@@ -69,6 +78,34 @@ public class ErpProjectContractsServiceImpl implements IErpProjectContractsServi
         return baseMapper.selectCustomErpProjectContractsVoList(lqw);
     }
 
+    public BigDecimal sumProjectLinkedContractTotalPrice(Long projectId) {
+        MPJLambdaWrapper<ErpProjectContracts> lqw = JoinWrappers.lambda(ErpProjectContracts.class);
+        lqw.eq(ErpProjectContracts::getProjectId, projectId);
+        lqw.eq("t.del_flag", "0");
+        List<ErpProjectContractsVo> links = baseMapper.selectCustomErpProjectContractsVoList(lqw);
+        if (CollUtil.isEmpty(links)) {
+            return BigDecimal.ZERO.setScale(2, RoundingMode.HALF_UP);
+        }
+        return links.stream()
+            .map(ErpProjectContractsVo::getTotalPrice)
+            .filter(Objects::nonNull)
+            .reduce(BigDecimal.ZERO, BigDecimal::add)
+            .setScale(2, RoundingMode.HALF_UP);
+    }
+
+    @Override
+    public void syncProjectAmountByLinkedContracts(Long projectId) {
+        BigDecimal totalAmount = sumProjectLinkedContractTotalPrice(projectId);
+        ErpProjectInfo updateProject = new ErpProjectInfo();
+        updateProject.setProjectId(projectId);
+        updateProject.setAmount(totalAmount);
+        projectInfoMapper.updateById(updateProject);
+    }
+
+    /**
+     * 已有项目：列表展示金额为项目关联合同总价之和
+     */
+
     private MPJLambdaWrapper<ErpProjectContracts> buildQueryWrapper(ErpProjectContractsBo bo) {
         Map<String, Object> params = bo.getParams();
         MPJLambdaWrapper<ErpProjectContracts> lqw = JoinWrappers.lambda(ErpProjectContracts.class)